- Title
- Reformation of pool-riffle sequences and induced bed amouring in a sand-bed stream following river rehabilitation
- Creator
- Keene, A. F.; Bush, R. T.; Cheetham, M. D.; Erskine, W. D.
- Relation
- International Symposium on Sediment Dynamics in Changing Environments. Sediment Dynamics in Changing Environments (Christchurch, NZ 1-5 December, 2008) p. 576-583
- Relation
- http://www.iahs.info
- Publisher
- International Association of Hydrological Sciences
- Resource Type
- conference paper
- Date
- 2008
- Description
- A series of structures was built along Widden Brook to trap sandy bed load as part of a river rehabilitation project. Stock-proof fencing of the riparian corridor was also carried out. The combination of in-stream structures and riparian revegetation has successfully sequestered large volumes of sand over the last six years, causing a substantial reduction in downstream sand supply. Downstream channel response to sand sequestration has included up to 1 m of bed degradation, channel contraction to less than half of the initial channel width, formation of marginal in-channel benches, reformation of a well-defined, rhythmically-spaced pool-riffle sequence and creation of a partially gravel-armoured bed surface. Sand storage in the study reach has starved the river immediately downstream, inducing bed erosion and the size-selective transport of sand and fine gravel. Residual pool depths now store four times the volume of water that was present before the start of river rehabilitation.
- Subject
- channel response; sand storage; residual pool depth; grain size analysis; longitudinal profile; Widden Brook
- Identifier
- uon:6191
- Identifier
- http://hdl.handle.net/1959.13/802730
- Identifier
- ISBN:9781901502848
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